In that world, of course a non-standard Magic back would be a dealbreaker for any card
In Magic's case, this is usually because they cost too much, so by the time you can cast it, you would already be ahead in the match
Probably worth noting that Mike Long is notorious for a history of cheating in high-stakes MTG events, so maybe Rootwater Thief was his comeuppance
Number One The Little Lizard That Could
Mill pivot: Teferis Tutelage + Fraying Sanity plus counters Thought Collapse/Didnt Say Please can deck opponents unexpectedly
Featuring the Pokmon Chansey a Pokmon known for its healing abilities and cute cry the card has since taken the record for the most a Chansey card has ever been sold for after being auctioned off for $63,000 (51,590) by PWCC auctioneers